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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9494d57214f7e458531b654f49d36354daf32415186822e96a4987589dbe64e2' 
  AND token = '12Slw09n2/SQ4woYJEQU1oRQB3wTAjFaQsYxU+253kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}